/*
 * Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package com.sun.org.apache.xml.internal.security.utils;

import java.io.IOException;
import java.io.OutputStream;

/**
 * A class that buffers without synchronizing its methods
 *
 * @author raul
 */
public class UnsyncBufferedOutputStream extends OutputStream {

  static final int size = 8 * 1024;

  private int pointer = 0;
  private final OutputStream out;

  private final byte[] buf;

  /**
   * Creates a buffered output stream without synchronization
   *
   * @param out the outputstream to buffer
   */
  public UnsyncBufferedOutputStream(OutputStream out) {
    buf = new byte[size];
    this.out = out;
  }

  /**
   * @inheritDoc
   */
  public void write(byte[] arg0) throws IOException {
    write(arg0, 0, arg0.length);
  }

  /**
   * @inheritDoc
   */
  public void write(byte[] arg0, int arg1, int len) throws IOException {
    int newLen = pointer + len;
    if (newLen > size) {
      flushBuffer();
      if (len > size) {
        out.write(arg0, arg1, len);
        return;
      }
      newLen = len;
    }
    System.arraycopy(arg0, arg1, buf, pointer, len);
    pointer = newLen;
  }

  private void flushBuffer() throws IOException {
    if (pointer > 0) {
      out.write(buf, 0, pointer);
    }
    pointer = 0;

  }

  /**
   * @inheritDoc
   */
  public void write(int arg0) throws IOException {
    if (pointer >= size) {
      flushBuffer();
    }
    buf[pointer++] = (byte) arg0;

  }

  /**
   * @inheritDoc
   */
  public void flush() throws IOException {
    flushBuffer();
    out.flush();
  }

  /**
   * @inheritDoc
   */
  public void close() throws IOException {
    flush();
    out.close();
  }

}
